Drag-line bucket.



H. T. DUNBAR.

DRAG LINE BUCKET.

APPLICATION FILED 001". 22, 1913.

1,132,078. Patented Mar. 16,1915.

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HARRIS T. DUNBAR, 0F BUFFALO, NEW YORK.

DRAG-LINE BUCKET.

Application filed October 22, 1913.

To all whom it may concern:

Be it known that I, HARRIs T. DUNBAR, a citizen of the United States, residing at Bull'alo, in the county of Erie and State of New York, have invented new and useful Improvements in Drag-Line Buckets, of which the following is a specification.

This invention relates to that class of buckets which are dragged by a hoisting mechanism or other means over the material which is to be elevatedand transported for the purpose of filling the scoop of the bucket with this material preparatory to transporting it elsewhere. Such buckets are commonly known in the art as drag line buckets. When these buckets are used for excavating or transporting material containing large rocks or lumps of other material it is diliicult to fill the scoop properly with a load of such material with the result that the scoop is very frequently only partly filled, thereby working the bucket short of its full or maximum capacity and increasing the cost of the work accordingly.

It is the purpose of this invention to provide a drag line bucket having means where.- by during the initial part of the hoisting movement of tl e bucket any large lumps or rocks arranged adjacent to the mouth of the scoop or projecting partly into the same will be pushed fully into the scoop so that the latter will be loaded properly or more nearly approaching its maximum capacity and thereby reduce the cost of transporting the material.

In the accompanying drawings: Figure 1 is a side elevation of the drag line bucket embodying one form of my invention and showing the parts in the position which they occupy when the bucket is being dragged over the material which is to be filled into the scoop of the bucket. Fig. 2 is a top plan view thereof. Fig. 3 is a vertical longitudinal section of the bucket showing the parts in the position which they occupy after the initial part of the lifting pull on the bucket has been effected.

Similar characters of reference indicate corresponding parts throughout the several views.

My improved bucket comprises a scoop which is constructed substantially like those now in common use and consists preferably of a bottom 1, two longitudinal side walls 2 projecting upwardly from opposite longitudinal edges of the bottom, and a transverse Specification of Letters Patent.

Patented Mar. f6, 1915.

Serial No. 798,722.

rear end wall 3 projecting upwardly from the rear end of the bottom and connecting with the rear ends of the side walls. A scoop is thus formed which has a mouth or inlet at the front end thereof and has an open top.

The means for pushing any large rocks or lumps rearwardly into the mouth of the scoop during the initial lifting movement of the bucket elevating device may be effected by various means, those shown in the drawlngs being suitable for the purpose and consist of a loading yoke which comprises two rock levers 4, 4, an upper transverse connect- 111g bar 5 and a lower transverse push bar 6. The two rock levers 4;, 4 are arranged respectively along the outer sides of the longitudinal side walls of the scoop adjacent to the front ends thereof and are pivoted between their upper and lower arms so as to be capable of swinging in a vertical plane by means of a horizontal pivot pin 7 passing transversely through the upper parts of the scoop side walls and said levers. lhe cross bar 5 is horizontal and connects the upper arms of the rock levers and the transverse push bar 6 is also horizontal and connects the lower arms of the rock levers.

The forward movement of the scoop may be effected by various means, for instance, by a drag or pull line composed. preferably of two parts or sections 8, 8 which are connected with the outer or lower ends of the levers and lead to a suitable drum of a hoisting machine.

The lifting or hoisting of the bucket is effected by connecting the upper part of the loading yoke, for instance the upper cross bar 5 with the lower end of a hoisting or lifting line or cable 9 leading to a suitable drum on the hoisting machine.

The dumping of the bucket is effected by means which comprise a dumping line 10 connected at its lower end with the rear part of the scoop while its upper or other end is connected to a suitable drum on the hoisting machine for controlling this line.

For the pupose of loading the scoop the lifting and dumping lines 9, 10 are slackened and the drag or pull line is hauled away, thereby causing a forward pull on the lower arms of the yoke which causes the levers to assume a substantially horizontal position and the push bar 6 to be lifted in front of the upper part of the mouth of the scoop, as shown in Figs. 1 and During the continued forward movement of the drag line, while the parts are in this position, the scroop is dragged with its mouth over the material which is to be excavated or trans ported whereby a certain amount of this material is gathered or loaded into the scoop. Owing to the resistance which the material in the scoop offers to the entrance of further material into the same there is a limit to the amount of material which may be thus loaded into the scoop with the result that if the scoop continues to move ov r the loose material after receiving its maximum load in this manner any material lying in front of the same will be swept aside and result in waste of time and power. Upon slackening on the drag line and drawing up on the lifting or hoisting line the first or initial ei'fect of this movement will cause the loading yoke to be turned in a direction which will cause its rock levers to swing into an upright position. During this movement of the yoke the push bar moves from a position in front of the upper part of the mouth of the scoop, as shown in Fig. 1, downwardly across the mouth of the scoop and into a position underneath the front part of the scoop, as shown in Fig. 3. As the push bar moves from its elevated to its lowered position the same engages with the front side of any large rock or lump of other material lying upon the ground immediately in front of the scoop or projecting partly into the mouth thereof and pushes the same rearwardly into the mouth a sufficient extent to cause such rock or lump to become a part of the load within the scoop and be elevated and transported by the same during the continued upward pull of the hoisting or lifting line.

After the bucket has reached the desired position where the contents is to be discharged therefrom this can be done by holding the dumping line at rest and lowering the lifting line, or the lifting line may be held at rest and the dumping line raised. In either case the rear end of the scoop is elevated relatively to the front end thereof so that the contents of the scoop is discharged therefrom.

This loading device for the bucket fully clears the mouth. of the bucket after performing its work so that no interference occurs with the free discharge of the material from the scoop.

It will be obvious from the foregoing eX- planation that the means just described permits of accomplishing the purpose of this invention without the employment of any parts which are delicate or liable to get out of order and without any material addition to the cost of buckets as heretofore constructed. Furthermore, by the use of this bucket a considerable addition to the load of the scoop may be effected, thereby effecting a considerable saving in the cost of transporting materials of the character described.

I claim as my invention:

1. A drag line bucket comprising a scoop, and a vertically swinging loading yoke pivoted on the front end of the scoop and provided with a push member which is adapted to swing across the mouth of the scoop and underneath the latter.

2. A drag line bucket comprising a scoop, and a loading yoke pivoted between its upper and lower ends on the front part of the scoop to swing ver ically and provided be low its pivot with a push member which is adapted to swing from a point above the mouth of the scoop downwardly across said nouth and underneath the scoop.

A dragline bucket comprising a scoop, a loading yoke pivoted between its upper and lower ends on the front part of the scoop to swing vertically and provided below its pivot with a push member which is adapted to swing from a point above the mouth of the scoop downwardly across said mouth and underneath the scoop, a drag line connected with the lower part of said yoke, a lifting line connected with the upper part of said yoke, and a dumping line conneced vith the rear part of the scoop.

4. A drag line bucket comprising a scoop having a mouth at its front end, and a yoke having two vertically swinging levers each of which. is pivoted between its ends on the outer side of the longitudinal walls of the scoop and a horizontal transverse push bar connecting the lower ends of said levers and adapted to swing across said mouth and toward and from a position below the front part of the scoop.

5. A drag line bucket comprising a scoop having a mouth at its front end, a yoke having two vertically swinging levers each of which is pivoted between its ends on the outer side of the longitudinal walls of the scoop and a horizontal transverse push bar connecting the lower ends of said levers and adapted to swing across said mouth and toward and from a position below the front part of the scoop, a drag line connected with the lower part of said yoke, a lifting line connected with the upper part of said yoke, and a dumping line connected with the rear part of the scoop.

.Vitness my hand this 21st day of October, 1913.

HARRIS T. DUNBAR.

lVitnesses:

THEO. L. Parr, E. M. GRAHAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, I). G. 

